Elemental distribution and fracture properties of magnetron sputtered carbon supersaturated tungsten films
Artikel i vetenskaplig tidskrift, 2024
The combination of strength and toughness is a major driving force for alloy design of protective coatings, and nanocrystalline tungsten (W)-alloys have shown to be promising candidates for combining strength and toughness. Here we investigate the elemental distribution and the fracture toughness of carbon (C) alloyed W thin films prepared by non-reactive magnetron sputtering. W:C films with up to ~4 at.% C crystallize in a body-centered-cubic structure with a strong 〈hh0〉texture, and no additional carbide phases are observed in the diffraction pattern. Atom probe tomography and X-ray photoelectron spectroscopy confirmed the formation of such a supersaturated solid solution. The pure W film has a hardness ~13 GPa and the W:C films exhibit a peak hardness of ~24 GPa. In-situ micromechanical cantilever bending tests show that the fracture toughness decreases from ~4.5 MPa·m1/2 for the W film to ~3.1 MPa·m1/2 for W:C films. The results show that C can significantly enhance the hardness of W thin films while retaining a high fracture toughness.
Tungsten
Atom probe tomography
XPS
PVD
Fracture toughness
Författare
Stefan Fritze
Uppsala universitet
R. Hahn
Technische Universität Wien
Hisham Aboulfadl
Chalmers, Fysik, Mikrostrukturfysik
Fredrik O.L. Johansson
Kungliga Tekniska Högskolan (KTH)
Universität Potsdam
Helmholtz-Gemeinschaft Deutscher Forschungszentren
R. Lindblad
Uppsala universitet
Katalin Böőr
Uppsala universitet
Andreas Lindblad
Uppsala universitet
E. Berggren
Uppsala universitet
D. Kühn
Helmholtz-Gemeinschaft Deutscher Forschungszentren
T. Leitner
Helmholtz-Gemeinschaft Deutscher Forschungszentren
B. Osinger
Uppsala universitet
E. Lewin
Uppsala universitet
U. Jansson
Uppsala universitet
P. H. Mayrhofer
Technische Universität Wien
Mattias Thuvander
Chalmers, Fysik, Mikrostrukturfysik
Surface and Coatings Technology
0257-8972 (ISSN)
Vol. 477 130326CVD 2.0 - En ny generation av hårda beläggningar
Stiftelsen för Strategisk forskning (SSF) (RMA15-0048), 2016-05-01 -- 2021-06-30.
Ämneskategorier (SSIF 2011)
Tribologi
Infrastruktur
Chalmers materialanalyslaboratorium
DOI
10.1016/j.surfcoat.2023.130326